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Title:
CONTROL METHOD OF AUTOMATIC CONTROL PNEUMATIC APPARATUS
Document Type and Number:
Japanese Patent JPH10306801
Kind Code:
A
Abstract:

To reduce overshoot of control variables in a pneumatic apparatus having a dead time.

When reference signals Sr change step by step, since a switch 208 is open, a pneumatic apparatus 15 having a dead time is started to drive by PD control. After a lapse of the dead time, controlled variables change to make a location detecting element 20 issue output signals, resulting in changing from zero a value of a velocity signal Sv, which is a differential value of a feedback signal Sf. If a velocity detecting element 214 detects that the value of the velocity signal Sv is a predetermined value Svr or more, the switch 208 is shifted from open to close. After the shift, the pneumatic apparatus 15 is driven by PID control. Therefore, overshoot of the controlled variables, resulting from integrating the dead time by means of I control, is reduced.


Inventors:
Irokawa, Kenji
Aki, Tomohiko
Application Number:
JP1997000113277
Publication Date:
November 17, 1998
Filing Date:
May 01, 1997
Export Citation:
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Assignee:
SMC CORP
International Classes:
F15B5/00; F15B9/09; G05B11/42; G05D16/20; (IPC1-7): F15B5/00
Attorney, Agent or Firm:
千葉 剛宏 (外1名)



 
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